Sash-lock.



G. TAKACS.

SASH LOCK.

APPLICATION FILED'JULY 19, 1913.

Patented June 1, 1915.

ATTUFINEYEI.

cs, or nurrano, new .vonn.

SASH-LOGK.

Application filed July 19, 1913. Serial No. 780,006.

To all whom it may concern y it known that I, GEORGE 'llAKAos, a citizenof the United States, residing at Bufl'alo, in the county of Erieand-State of New York, have invented new and useful Improvements inSash-Locks, of which the following is a specification.

This invention has for its object the production of a sash lock forwindows which can be set so as to lock the relatively movable members ofa window in a more or less open position against being further openedand which is so constructed that the windows may be left unlocked in anopen position but will become automatically locked the instant one ofthe movable members of the window is moved relatively to the other in adirection tending to close either one of the other of the windowmembers.

In the accompanying drawings: Figure 1 is a sectional perspective viewof a window having its sashes or movable members equipped with myimproved sash lock. Fig. 2 is a vertical transverse section thereof.Fig. 3 is a top plan view of a part of the lock. Fig. 4 is a frontelevation of the same. Fig. 5 is a vertical transverse section taken inline 5--5, Fig. 4.

Similar characters of reference indicate corresponding parts throughoutthe several views.

Although my improved sash lock may be applied to windows which may varyas to details of construction the same is shown in the drawings inconnection with a. window having upper and lower sashes 1, 2 which areguided to move vertically in runways or channels in the window frame 3.

@ne of the movable members of the window, preferably the upper sash 1 ispro- Specification of Letters Patent.

Patented June t, thllld.

versely movable locking bolt 7 the outer or front end of which isadapted to be engaged with one or the other of the teeth 'of the lockingrack. lhis end of the looking bolt is provided with a horizontal orabrupt upper side and a beveled or inclined underside so that when thisbolt is in engagement with the locking rack the upper sash is preventedfrom being opened or moved downwardly relatively to the lower sash andthe lower sash is prevented from being opened or moved upwardlyrelatively to the upper sash, but both sashes are permitted to movefreely apart or away from each other into their closed positions.

This locking bolt may be guided in any suitable manner but preferably ina guideway or casing 8 which is secured to the upper side of the lowersash adjacent to one of its vertical edges thereof and the same isyieldingly moved in a direction which will engage its front end with thelocking rack by means of a spring 10 surrounding a shank 11 projectinginwardly from the rear end of the locking bolt through an opening in theguide casing and bearing with its inner end against the guide casingwhile its outer end bears against the shoulder 12 on said shank.

Adjacent to the inner end of the lockin bolt its shank is provided withan upwardly projecting lug 13. To this lug is pivoted for verticalrotation a trip lever 14 which is adapted to engage its outer free endwith the looking rack. When the trip lever is free the same isyieldingly held in an upright position by means of a spring 15surrounding the pivot pin 16 which connects the trip lever and the lug13 and bears with its opposite ends against this lever and lug,respectively. The upward and inward turning movement of the trip leverunder the action of the spring 15 is arrested when the trip leverreaches an upright position, this being preferably efl'ected by means ofa stop shoulder or heel 17 formed on the upper end of the pivot lug 13and engaging with a corresponding shoulder 18 on the of the window in amore or less open position relatively to each other the locking bolt iswithdrawn from the locking rack and then reengaged therewith after oneor both sashes have been moved to the desired open position after whichfurther opening of the sashes is prevented by engaging the abrupt sideof the end of the locking bolt with the respective tooth of the lockingrack.

While thus moving the sashes one relatively to the other the lockingbolt may be retained in a retracted or inoperative position withoutholding the same manually this being effected by pushing the trip leveroutwardly and downwardly so that it stands in a horizontal position andengages its outer end with the face of the locking rack and itsunderside with the top of the casing 8. The parts of the lock are soproportioned that when the trip lever is thus engaged with the lockingrack the outer or front end of the locking bolt will be withdrawn fromthe locking rack and held in this position, as shown in Fig. 2. I

By thus setting the lock so that the bolt is held in its retractedposition by engaging the trip lever with the rack both hands of a personmay be employed for raising the lower sash which is very desirable inthe case of heavy sash or sashes which tend to stick. Furthermore, byfirst setting the lock in its released position while the sash is in itslowered position, this sash may be raised to a position which wouldbring the look beyond the reach of the operator. In either case, afterthe lower sash has been raised as far as desired, a slight downwardmovement of the lower sash causes the trip lever to be turned upwardslightly and released from the rack so that the spring 15 can completethis movement and permit the spring 10 to push the locking boltforwardly into engagement with the rack for preventing further upwardopening movement of the lower sash.

If any attempt should be made to move either one of the sashes up ordown while the trip lever thus engages with the locking rack thismovement tends to release the trip lever which is only held by thepressure of the spring 10 in frictional engagement with the lockingrack, and when thus released the spring 15 instantlv operates to swingthe trip lever from its horizontal operative position, shown in Fig. 2,to its upright or inoperative position, as shown in Figs. 1 and 4,thereby permitting the main spring 10 to push the locking bolt forwardlyor outwardly into engagement with the locking rack and thereby preventopening of either one or the other of the sashes if this should beattempted. Closing of the sashes can, however, be efiected withouthindrance inasmuch as during such movement the locking rack merely tripspast the beveled surface of the front end of the locking bolt.

It will thus be seen that when this locking bolt is held in itsretracted position by means of the trip lever which frictionally engagesthe locking rack that the locking device at this time is delicatelypoised and that a very slight release of the frictional contact betweenthis lever and the locking rack, such as occurs when tampering with thewindow from the outer side of the building, would operate to release thetrip lever and thereby operate to automatically lock the sashes againstfurther movement in a direction which would open the same. If thereforewhen opening the window moderately the locking bolt has not been engagedwith the rack but has been, through oversight, left in a retractedposition by engagement of the trip lever with the rack, a slightdownward movement of the lower sash or a slight upward movement of theupper sash will liberate the locmng bolt and permit the same to engageinto the rack.

'l'his sash lock is very simple and inexpensive in construction and canbe readily applied to the sashes of windows as now commonly made withoutrequiring any alteration of the same.

Furthermore, this sash lock can be very easily operated, the same isvery neat in appearance and it forms an effective safe guard againstentrance into the building through the window by unauthorized persons.

I claim as my invention:

1. A lock for windows having members which are relatively movablecomprising a rack arranged on one of said members. a locking boltmounted on the other member and adapted to engage said rack. a triplever connected with said bolt and adapted to engage a part on thewindow member which carries said rack for holding said bolt out ofengagement from said rack and means operating to press said boltyieldingly toward said rack.

2. A lock for windows having upper and lower movable sashes, a racksecured to the upper sash, a locking bolt adapted to engage said rack, acasing which is mounted on the lower sash and in which the locking boltis guided, a spring interposed between said casing and bolt andoperating to hold the latter yieldingly in engagement with said rack, atrip lever pivoted on said bolt and adapted to engage said rack, and aspring adalpted to move said lever away from said rac r 3. A lock forwindows having upper and lower movable sashes, a rack secured to theupper sash, a locking bolt adapted to engage mamae it said rack, acasing which is mounted on the stop device for limiting the movement oflower sash and in which the locking bolt is said trip lever away fromsaid rack. 10 guided, a spring interposed between said cas- Witness myhand this 17th day of July, ing and bolt and operating to hold thelatter 1913.

5 yieldingly in engagement with said rack, a GEORGE T k I: trip leverpivoted on said belt and adapted Witnesses:

to engage said rack, a spring adapted to IGNATZ ZIMMLE,

move said lever away from said rack and a PETER BERMEL.

